Air filter restriction monitoring without pre-throttle pressure sensors
AssigneeGM Global Technology Operations LLC
InventorsWenbo Wang, Michael A. Kropinski, Kurt D. Mc Lain
Life of this patent
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Abstract
A method of monitoring air flow restriction in an air intake of an internal combustion engine includes recording a predetermined number of pre-throttle pressure samples, recording a predetermined number of mass air flow samples, which respectively correspond to the pre-throttle pressure samples and determining a slope based on the pre-throttle pressure samples and the mass air flow samples. Whether an air filter is inducing an air flow over restriction is determined based on the slope.
Claims21
A method of monitoring air flow restriction in an air intake of an internal combustion engine, comprising:
- recording a predetermined number of pre-throttle pressure samples;
- recording a predetermined number of mass air flow samples, which respectively correspond to said pre-throttle pressure samples;
- determining a slope based on said pre-throttle pressure samples and said mass air flow samples;
- and
- determining whether an air filter is inducing an air flow over restriction based on said slope.
A system for monitoring air flow restriction in an air intake of an internal combustion engine, comprising:
- a first module that records a predetermined number of pre-throttle pressure samples and that records a predetermined number of mass air flow samples, which respectively correspond to said pre-throttle pressure samples;
- a second module that determines a slope based on said pre-throttle pressure samples and said mass air flow samples;
- and
- a third module that determines whether an air filter is inducing an air flow over restriction based on said slope.
A method of monitoring air flow restriction in an air intake of an internal combustion engine, comprising:
- determining whether a plurality of operating parameter conditions are met;
- recording a predetermined number of pre-throttle pressure samples and mass air flow samples, which respectively correspond to said pre-throttle pressure samples when said plurality of operating parameters conditions are met;
- determining a slope based on said pre-throttle pressure samples and said mass air flow samples;
- and
- determining whether an air filter is inducing an air flow over restriction based on said slope.
Dependencies are inferred from the claim text.